Exactly. It's analogous to the game where one person taps out the rhythm of a melody and the other person tries to guess which song it is. It seems so obvious t

Exactly. It's analogous to the game where one person taps out the rhythm of a melody and the other person tries to guess which song it is. It seems so obvious to the person doing the tapping, because their head is loaded with all the other context of the song; namely, the harmony and melody. None of that context is available to the recipient.